If you regularly perform a particular exercises, the body becomes accustomed to them, the muscles respond more effectively, which eventually leads to poor combustion of calories.

Therefore, it is useful to every two to six weeks to change the exercises, or increase the intensity of those that you normally perform.

For example, if you run several miles every day, it would be good to add sometimes faster intervals, increase mileage or to try some other activity. After a few weeks, return to the old routine, and do everything from scratch.

Cardio exercise like interval training may also help because they burn more calories and shape muscles.